<template>
  <div>
    <el-form inline>
      <el-form-item>
        <el-input v-model="tempSearchObj.roleName" placeholder="角色名称"/>
      </el-form-item>

      <el-button type="primary" icon="el-icon-search" @click="search">查询</el-button>
      <el-button @click="resetSearch">清空</el-button>
    </el-form>

    <div style="margin-bottom: 20px">
      <el-button type="primary"  @click="addRole">添加</el-button>
      <el-button type="danger" @click="removeRoles()" :disabled="selectedRoles.length === 0">批量删除</el-button>
    </div>

    <el-table
      border
      stripe
      style="width: 960px"
      v-loading="listLoading"
      :data="roles"
      @selection-change="handleSelectionChange">

      <el-table-column
        type="selection"
        width="55" />

      <el-table-column
        type="index"
        label="序号"
        width="80"
        align="center">
      </el-table-column>

      <el-table-column label="角色名称">
        <template slot-scope="{row}">
          <template v-if="row.edit">
            <el-input v-model="row.roleName" class="edit-input" size="small" />
            <el-button
              class="cancel-btn"
              size="small"
              icon="el-icon-refresh"
              type="warning"
              @click="cancelEdit(row)"
            >
              取消
            </el-button>
          </template>
          <span v-else>{{ row.roleName }}</span>
        </template>
      </el-table-column>
      
      <el-table-column label="操作" width="300" align="center">
        <template slot-scope="{row}">
          <HintButton size="mini" type="info" icon="el-icon-info" title="分配权限"
            @click="$router.push(`/acl/role/auth/${row.id}?roleName=${row.roleName}`)"/>

          <HintButton size="mini" type="primary" icon="el-icon-check" title="确定" 
            @click="updateRole(row)" v-if="row.edit"/>
          <HintButton size="mini" type="primary" icon="el-icon-edit" title="修改角色" 
            @click="row.edit= true" v-if="!row.edit"/>

            
          <HintButton size="mini" type="danger" icon="el-icon-delete" title="删除角色"
            @click="removeRole(row)"/>
        </template>
      </el-table-column>
    </el-table>

    <!-- 分页组件 -->
    <el-pagination
      :current-page="page"
      :total="total"
      :page-size="limit"
      :page-sizes="[5, 10, 20, 30, 40, 50, 100]"
      style="padding: 20px 0;"
      layout="prev, pager, next, jumper, ->, sizes, total"
      @current-change="getRoles"
      @size-change="handleSizeChange"
    />
  </div>
</template>

<script>

export default {

  name: 'RoleList',

  data() {
    return {
      listLoading: true, // 数据是否正在加载
      roles: [], // 角色列表
      total: 0, // 总记录数
      page: 1, // 当前页码
      limit: 5, // 每页记录数
      tempSearchObj: { // 收集搜索条件数据
        roleName: '',
      },
      searchObj: { // 发送请求的条件参数数据
        roleName: '',
      },
      selectedRoles: [] // 所有选中的角色列表
    }
  },

  mounted() {
    this.getRoles()
  },

  methods: {

    /* 
    取消修改
    */
    cancelEdit(role) {
      role.roleName = role.originRoleName
      role.edit = false
      this.$message.warning('取消角色修改')
    },

    /* 
    更新角色
    */
    updateRole (role) {
      this.$API.role.updateById({id: role.id, roleName: role.roleName})
        .then(result => {
          this.$message.success(result.message|| '更新角色成功!')
          this.getRoles(this.page)
        })
    },

    /* 
    每页数量发生改变的监听
    */
    handleSizeChange(pageSize) {
      this.limit = pageSize
      this.getRoles()
    },

    /* 
    添加角色
    */
    addRole(){
      // 显示添加界面
      this.$prompt('请输入新名称', '添加角色', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
      }).then(({ value }) => {
        this.$API.role.save({roleName: value}).then(result => {
          this.$message.success(result.message || '添加角色成功')
          this.getRoles()
        })
      }).catch(() => {
        this.$message.warning('取消添加')
      })
    },

    /* 
    异步获取角色分页列表
    */
    getRoles(page = 1) {
      this.page = page
      this.listLoading = true
      const {limit, searchObj} = this
      this.$API.role.getPageList(page, limit, searchObj).then(
        result => {
          const {items, total} = result.data
          this.roles = items.map(item => {
            item.edit = false // 用于标识是否显示编辑输入框的属性
            item.originRoleName = item.roleName // 缓存角色名称, 用于取消
            return item
          })
          this.total = total
        }
      ).finally(() => {
        this.listLoading = false
      })
    },

    /* 
    根据搜索条件进行搜索
    */
    search () {
      this.searchObj = {...this.tempSearchObj}
      this.getRoles()
    },

    /* 
    重置查询表单搜索列表
    */
    resetSearch() {
      this.tempSearchObj = {
        roleName: ''
      }
      this.searchObj = {
        roleName: ''
      }
      this.getRoles()
    },

    /* 
    删除指定的角色
    */
    removeRole ({id, roleName}) {
      this.$confirm(`确定删除 '${roleName}' 吗?`, '提示', {
        type: 'warning'
      }).then(async () => {
        const result = await this.$API.role.removeById(id)
        this.getRoles(this.roles.length===1 ? this.page-1 : this.page)
        this.$message.success(result.message || '删除成功!')
      }).catch(() => {
        this.$message.info('已取消删除')
      })
    },

    /* 
    当表格复选框选项发生变化的时候触发
    */
    handleSelectionChange(selection) {
      this.selectedRoles = selection
    },

    /* 
    批量删除
    */
    removeRoles () {
      this.$confirm('此操作将永久删除该记录, 是否继续?', '提示', {
        type: 'warning'
      }).then(async () => {
        const ids = this.selectedRoles.map(role => role.id)
        const result = await this.$API.role.removeRoles(ids)
        this.getRoles()
        this.$message({
          type: 'success',
          message: '批量删除成功!'
        })
      }).then((result) => {
        
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })
    }
  }
}
</script>

<style scoped>
.edit-input {
  padding-right: 100px;
}
.cancel-btn {
  position: absolute;
  right: 15px;
  top: 10px;
}
</style>